181400915537 has 2 divisors, whose sum is σ = 181400915538. Its totient is φ = 181400915536.

The previous prime is 181400915497. The next prime is 181400915587. The reversal of 181400915537 is 735519004181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126820742161 + 54580173376 = 356119^2 + 233624^2 .

It is a cyclic number.

It is not a de Polignac number, because 181400915537 - 2²⁴ = 181384138321 is a prime.

It is not a weakly prime, because it can be changed into another prime (181400915587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90700457768 + 90700457769.

It is an arithmetic number, because the mean of its divisors is an integer number (90700457769).

Almost surely, 2^181400915537 is an apocalyptic number.

It is an amenable number.

181400915537 is a deficient number, since it is larger than the sum of its proper divisors (1).

181400915537 is an equidigital number, since it uses as much as digits as its factorization.

181400915537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 44.

The spelling of 181400915537 in words is "one hundred eighty-one billion, four hundred million, nine hundred fifteen thousand, five hundred thirty-seven".